Honeycomb Panel Assembly with Edge-Bonded Mesh for Acoustic Absorption
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Solution Overview
Problem
Traditional honeycomb structures for jet engine nacelles fail to improve sound transmission loss and acoustic absorption due to adhesive coverage of honeycomb openings, requiring complex fabrication processes and specialized machinery.
Innovation Solution
A panel assembly with a backing plate, two honeycomb layers, and a latent cure adhesive applied along the edges, combined with a mesh and optional foam within the honeycomb cells, allowing for easy assembly and improved sound absorption and transmission loss without covering the honeycomb openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to bond honeycomb layers and mesh, then structural bonding is achieved, but honeycomb openings are covered and sound absorption capability is reduced
Solution Approach 1:
The adhesive is applied locally only at the edges of the honeycomb layers rather than across the entire surface. This localized application ensures structural bonding at the boundaries while leaving the central honeycomb openings exposed to maintain sound absorption capability.
Solution Approach 2:
The mesh acts as an intermediary element that bridges the honeycomb layers. The adhesive bonds the mesh to the edges of the honeycomb layers, providing structural strength while the mesh itself fills and reinforces the honeycomb cells without blocking the openings.
2Reliability
If septum is inserted into each honeycomb cell to create 2-chambered structure, then sound absorption is improved, but fabrication time increases and specialized machinery is required
Solution Approach 1:
The mesh is combined with the honeycomb structure in a single assembly step rather than inserting separate septa into each cell. The mesh naturally conforms to and fills the honeycomb cells during the bonding process, achieving the desired multi-chamber configuration without requiring cell-by-cell insertion operations.
Solution Approach 2:
The mesh material self-adjusts and conforms to the honeycomb cell structure during assembly. The mesh automatically fills the cells and creates the intended acoustic chambers without requiring precision positioning or specialized insertion machinery for each individual cell.
3Ease of manufacture
If film adhesive is used to bond panels, then assembly is simplified, but adhesive may cover honeycomb openings and eliminate sound absorption
Solution Approach 1:
The film adhesive is applied in a controlled manner to bond only at specific edge locations of the honeycomb layers. This localized bonding approach maintains the simplicity of film adhesive application while preventing the adhesive from spreading over and covering the honeycomb openings that are essential for sound absorption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides enhanced sound absorption and transmission loss across a wide range of frequencies, reducing noise levels in jet engine nacelles while simplifying the assembly process and avoiding adhesive-related issues.
Implementation Method 1
an adhesive located along at least one edge of at least one of the honeycomb layers
Implementation Method 2
sound reverberates and cancels, thus creating acoustic sound absorption
Data Source
AI summary
A panel assembly and method of making the same, whereby the panel assembly includes an adhesive located onto one or more edges of a layered honeycomb structure and a mesh material adhered in between the layered honeycomb structure by the adhesive.